491603904 has 280 divisors, whose sum is σ = 1639720368. Its totient is φ = 144322560.

The previous prime is 491603887. The next prime is 491603923. The reversal of 491603904 is 409306194.

491603904 is a `hidden beast` number, since 49 + 1 + 603 + 9 + 0 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2109772 + ... + 2110004.

Almost surely, 2^491603904 is an apocalyptic number.

491603904 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491603904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (819860184).

491603904 is an abundant number, since it is smaller than the sum of its proper divisors (1148116464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491603904 is a wasteful number, since it uses less digits than its factorization.

491603904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305 (or 286 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 491603904 is about 22172.1425216419. The cubic root of 491603904 is about 789.2327668423.

The spelling of 491603904 in words is "four hundred ninety-one million, six hundred three thousand, nine hundred four".